Weather in Dallas in December

A good month. December is a solid month to be in Dallas. Highs sit at 14.3 °C and the day is short; this is an indoors-with-excursions month, not an outdoors-all-day one.

December ranks 6 of 12 in Dallas: past the worst of the year but short of November, which is the month to book if the dates are open.

Rain falls on only 6 days, so an itinerary with no wet-weather fallback is a reasonable risk. Layers, and a genuinely waterproof outer — at 14.3 °C the difference between a good day and a miserable one is entirely down to what you are wearing.

What the averages hide

Averages flatten a month, and this one hides a few things: 9 nights fall below freezing. Across the twenty years measured, the hottest December day reached 29.3 °C and the coldest night fell to -9.6 °C, and the wettest single day dropped 61 mm — roughly 100% of the month's rain in one day.

December is moderately variable: 7 mm in the driest year against 124 mm in the wettest, around an average of 61 mm. Roughly two Decembers in three land near that average, and the third does something else entirely.

Wind is light at 11.1 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 73%.

How December sits in the year

Temperatures hold steady either side: 19.9 °C in November, 14.3 here, 13.3 in January. Nothing about the timing within the month matters much.

Daylight in December

December sits at the dark end of Dallas's year — 10 hours of daylight against 14.3 at midsummer, holding steady all month. Sightseeing days are genuinely shorter, and an itinerary built for summer will not fit.

An inland climate

With no coast nearby, the year swings a fair way — 35.1 °C between the warmest afternoons and the coldest nights, wider than any coastal city at this latitude would manage.

How busy it gets

Busy. Popular without being frantic; book the things you care about, improvise the rest.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

December in Dallas versus nearby

If Dallas is one option among several, the nearby comparison is worth making. Shreveport is close enough to be a coin toss — within a degree on temperature, 4 days more rain. Oklahoma City is the weaker option in December — 4.2 °C cooler, 1 day less rain.

So: December works, with November the better month by 18 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Dallas

See all twelve months in Dallas, or where else to go in December.